AndroidとJsが交互に戻り値を取得します.

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {//sdk>19   
                String script = ("javascript:getContent()");
                webView.evaluateJavascript(script, new ValueCallback() {
                    @Override
                    public void onReceiveValue(String responseJson) {
                    //  js   ，    
                        Log.i("aa", " responseJson" + responseJson);

                    }
                });
            } else {//sdk<19 ,  prompt   

                String[] paths = moduleUrl.split("/", 3);
              promptMap.put(paths[2], paths);
               webView.loadUrl("javascript:mandaobridge.getParams('!" + paths[2] + "')");
              LogUtils.d("Prompt  :" + "mandaobridge.getParams('!" + paths[2] + "')");
            }
            finish();